Chatrie v. United States (Geofence Warrants & Fourth Amendment)
Current understanding
Chatrie v. United States is a U.S. Supreme Court case addressing the Fourth Amendment constitutionality of geofence warrants — court orders that compel providers such as Google to disclose location data for all devices present in a defined geographic area during a specified time window near a crime scene. The practical effect for affected groups turns on whether such warrants satisfy particularity and probable-cause requirements or instead constitute impermissible general searches sweeping in bystanders’ location histories. Contested questions include how the third-party doctrine applies to fine-grained location data after Carpenter v. United States, what step-by-step disclosure protocols (if any) can cure overbreadth, and the downstream admissibility of geofence-derived evidence in criminal proceedings.
Evidence log
- 2026-07-21 — Protection Against Mass Surveillance Act: cross-connection with protection-against-mass-surveillance-act: Statutory limits proposed by HR9800 would complement judicial Fourth Amendment doctrine developing around bulk/geofence surveillance. (novelty: 3)
- 2009-06-17 — To prohibit the Secretary of Homeland Security from obligating or expending funds for the National Applications Office of the Department of Homeland Security.: cross-connection with dhs-national-applications-office-defunding: Both concern Fourth Amendment limits on bulk or geolocation-based government surveillance of U.S. persons, one through appropriations restrictions on satellite imagery and the other through judicial doctrine on geofence warrants. (novelty: 2)
- 2026-06-29 — Chatrie v. United States: cross-connection with fisa-title-vii-surveillance-authorities: Both concern the Fourth Amendment framework for large-scale collection of digital data implicating U.S. persons — geofence warrants in criminal investigations and Section 702 in foreign-intelligence surveillance. (novelty: 4)